Tag: Doppler

Have you ever wondered why the sound of a passing ambulance changes as it approaches and then moves away from you? Or why do the stars appear to have different colors depending on their motion relative to us? The answer lies in the definition of the Doppler Effect and how it works. The ...

Have you ever wondered why the sound of a passing ambulance changes as it approaches and then moves away from you? Or why do the stars appear to have different colors depending on their motion relative to us? The answer lies in the definition of the Doppler Effect and how it works. The ...

Now, I am going to assume that 95% of the people who are reading this are not astronomy geeks. I bet that 30% of the people reading this are also not experts in optics. Am I right ? So, for the sake of those 95% and 30% people, let me start from the basics. What is a spectrum of light? When li...